Laboratory Electronic Balance Selection Guide
The balance is an instrument for weighing the mass of the object. The electronic balance has the characteristics of simple structure, convenient and practical, fast weighing and so on. It is widely used in enterprises and laboratories to measure the quality of objects. Electronic balances are generally classified according to precision and can be divided into the following categories:
(1) The level below 1mg is called electronic precision balance (2) 0.1mg is called electronic analytical balance (3) 0.01mg is called quasi-micro balance (4) 1ug called microbalance (5) 0.1ug and above is called super The specific conversion ratio of the microelectronic balance is as follows: 100 mg = 0.1 g = one tenth 10 mg = 0.01 g = one percent 1 mg = 0.001 g = one thousandth 0.1 mg = 0.0001 g = one ten thousand 0.01 mg = 0.00001 g = one hundred thousandth 1μg=0.001mg=0.000001g=one millionth 0.1μg=0.0001mg=0.0000001g=10 millionths When purchasing a balance, the user needs to know several main technical parameters:
1. Full weighing: The maximum mass value (full load value) that the balance can weigh, often expressed in grams (g).
2. Sensing: The maximum mass required to shift the balance pointer from the equilibrium position to the dial one division. Therefore, the sensitivity is also called the division value, often expressed in milligrams (mg). The smaller the value, the more sensitive the balance.
3. Unequal arm: refers to the maximum value of weighing error caused by the unequality of the two arms of the beam (the distance between the middle knife edge and the left and right knife edges), often in milligrams or divisions. Sometimes it is also called the amount of deviation.
4. Variability: refers to the balance after the balance, due to the rise and fall of the beam system, resulting in the maximum deviation of the balance position of the pointer, often in milligrams or divisions. This is a parameter that indicates the stability of the balance.
5. Level of the balance: According to the current standard of China, according to the ratio of the nominal sense of the balance to the full scale of the balance, it is divided into 10 levels.
6. Travel code scale error: refers to the quality measured by the travel code to the position of each ruler of the ruler, and the maximum quality error of the corresponding standard weight. Also called riding code scale error or riding code error.
7. Nominal value and verification value: The specifications of each balance are marked with the above six technical parameters.
These six technical parameters are indicators for comprehensively measuring the measurement performance of the balance, but do not reflect the actual situation of the measurement performance of the balance. Therefore, it is called a nominal value or a nominal value. The actual situation of the balance measurement performance should be verified according to the prescribed procedures, and the verification value can be calculated. For newly purchased balances or repaired balances, the test value shall be no more than the nominal value (exactly, the nominal level shall be reached); some indicators of the balance in use (such as unequal arm) may be slightly Relax. The operation method of the electronic balance is simple, and the user who purchases the first time can refer to the manual for operation, and generally does not require professional installation and debugging.
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